These days I get the feeling a lot of the registrars are essentially/effectively in on it (at least by inaction). A well-run ICANN feels needed, who can track takedown compliance.
Funnily enough years ago I did a takedown request for terrorist material, realised that the host was in the same building as me. So when the ticket got closed and they didn't make any changes. I walked into their office and showed them a lovely video they had on their network.
Suddenly they took action.